4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 /** Implementation of client-side PortalRPC interfaces */
35 #define DEBUG_SUBSYSTEM S_RPC
37 #include "../include/obd_support.h"
38 #include "../include/obd_class.h"
39 #include "../include/lustre_lib.h"
40 #include "../include/lustre_ha.h"
41 #include "../include/lustre_import.h"
42 #include "../include/lustre_req_layout.h"
44 #include "ptlrpc_internal.h"
46 static int ptlrpc_send_new_req(struct ptlrpc_request *req);
47 static int ptlrpcd_check_work(struct ptlrpc_request *req);
48 static int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async);
51 * Initialize passed in client structure \a cl.
53 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
54 struct ptlrpc_client *cl)
56 cl->cli_request_portal = req_portal;
57 cl->cli_reply_portal = rep_portal;
60 EXPORT_SYMBOL(ptlrpc_init_client);
63 * Return PortalRPC connection for remote uud \a uuid
65 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
67 struct ptlrpc_connection *c;
69 lnet_process_id_t peer;
73 * ptlrpc_uuid_to_peer() initializes its 2nd parameter
74 * before accessing its values.
75 * coverity[uninit_use_in_call]
77 err = ptlrpc_uuid_to_peer(uuid, &peer, &self);
79 CNETERR("cannot find peer %s!\n", uuid->uuid);
83 c = ptlrpc_connection_get(peer, self, uuid);
85 memcpy(c->c_remote_uuid.uuid,
86 uuid->uuid, sizeof(c->c_remote_uuid.uuid));
89 CDEBUG(D_INFO, "%s -> %p\n", uuid->uuid, c);
95 * Allocate and initialize new bulk descriptor on the sender.
96 * Returns pointer to the descriptor or NULL on error.
98 struct ptlrpc_bulk_desc *ptlrpc_new_bulk(unsigned npages, unsigned max_brw,
99 unsigned type, unsigned portal)
101 struct ptlrpc_bulk_desc *desc;
104 desc = kzalloc(offsetof(struct ptlrpc_bulk_desc, bd_iov[npages]),
109 spin_lock_init(&desc->bd_lock);
110 init_waitqueue_head(&desc->bd_waitq);
111 desc->bd_max_iov = npages;
112 desc->bd_iov_count = 0;
113 desc->bd_portal = portal;
114 desc->bd_type = type;
115 desc->bd_md_count = 0;
116 LASSERT(max_brw > 0);
117 desc->bd_md_max_brw = min(max_brw, PTLRPC_BULK_OPS_COUNT);
119 * PTLRPC_BULK_OPS_COUNT is the compile-time transfer limit for this
120 * node. Negotiated ocd_brw_size will always be <= this number.
122 for (i = 0; i < PTLRPC_BULK_OPS_COUNT; i++)
123 LNetInvalidateHandle(&desc->bd_mds[i]);
129 * Prepare bulk descriptor for specified outgoing request \a req that
130 * can fit \a npages * pages. \a type is bulk type. \a portal is where
131 * the bulk to be sent. Used on client-side.
132 * Returns pointer to newly allocated initialized bulk descriptor or NULL on
135 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp(struct ptlrpc_request *req,
136 unsigned npages, unsigned max_brw,
137 unsigned type, unsigned portal)
139 struct obd_import *imp = req->rq_import;
140 struct ptlrpc_bulk_desc *desc;
142 LASSERT(type == BULK_PUT_SINK || type == BULK_GET_SOURCE);
143 desc = ptlrpc_new_bulk(npages, max_brw, type, portal);
147 desc->bd_import_generation = req->rq_import_generation;
148 desc->bd_import = class_import_get(imp);
151 desc->bd_cbid.cbid_fn = client_bulk_callback;
152 desc->bd_cbid.cbid_arg = desc;
154 /* This makes req own desc, and free it when she frees herself */
159 EXPORT_SYMBOL(ptlrpc_prep_bulk_imp);
162 * Add a page \a page to the bulk descriptor \a desc.
163 * Data to transfer in the page starts at offset \a pageoffset and
164 * amount of data to transfer from the page is \a len
166 void __ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
167 struct page *page, int pageoffset, int len, int pin)
169 LASSERT(desc->bd_iov_count < desc->bd_max_iov);
171 LASSERT(pageoffset >= 0);
173 LASSERT(pageoffset + len <= PAGE_SIZE);
180 ptlrpc_add_bulk_page(desc, page, pageoffset, len);
182 EXPORT_SYMBOL(__ptlrpc_prep_bulk_page);
185 * Uninitialize and free bulk descriptor \a desc.
186 * Works on bulk descriptors both from server and client side.
188 void __ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc, int unpin)
192 LASSERT(desc->bd_iov_count != LI_POISON); /* not freed already */
193 LASSERT(desc->bd_md_count == 0); /* network hands off */
194 LASSERT((desc->bd_export != NULL) ^ (desc->bd_import != NULL));
196 sptlrpc_enc_pool_put_pages(desc);
199 class_export_put(desc->bd_export);
201 class_import_put(desc->bd_import);
204 for (i = 0; i < desc->bd_iov_count; i++)
205 put_page(desc->bd_iov[i].bv_page);
210 EXPORT_SYMBOL(__ptlrpc_free_bulk);
213 * Set server timelimit for this req, i.e. how long are we willing to wait
214 * for reply before timing out this request.
216 void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req)
222 LASSERT(req->rq_import);
228 * \a imp_server_timeout means this is reverse import and
229 * we send (currently only) ASTs to the client and cannot afford
230 * to wait too long for the reply, otherwise the other client
231 * (because of which we are sending this request) would
232 * timeout waiting for us
234 req->rq_timeout = req->rq_import->imp_server_timeout ?
235 obd_timeout / 2 : obd_timeout;
237 at = &req->rq_import->imp_at;
238 idx = import_at_get_index(req->rq_import,
239 req->rq_request_portal);
240 serv_est = at_get(&at->iat_service_estimate[idx]);
241 req->rq_timeout = at_est2timeout(serv_est);
244 * We could get even fancier here, using history to predict increased
249 * Let the server know what this RPC timeout is by putting it in the
252 lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
254 EXPORT_SYMBOL(ptlrpc_at_set_req_timeout);
256 /* Adjust max service estimate based on server value */
257 static void ptlrpc_at_adj_service(struct ptlrpc_request *req,
258 unsigned int serv_est)
264 LASSERT(req->rq_import);
265 at = &req->rq_import->imp_at;
267 idx = import_at_get_index(req->rq_import, req->rq_request_portal);
269 * max service estimates are tracked on the server side,
270 * so just keep minimal history here
272 oldse = at_measured(&at->iat_service_estimate[idx], serv_est);
274 CDEBUG(D_ADAPTTO, "The RPC service estimate for %s ptl %d has changed from %d to %d\n",
275 req->rq_import->imp_obd->obd_name, req->rq_request_portal,
276 oldse, at_get(&at->iat_service_estimate[idx]));
279 /* Expected network latency per remote node (secs) */
280 int ptlrpc_at_get_net_latency(struct ptlrpc_request *req)
282 return AT_OFF ? 0 : at_get(&req->rq_import->imp_at.iat_net_latency);
285 /* Adjust expected network latency */
286 void ptlrpc_at_adj_net_latency(struct ptlrpc_request *req,
287 unsigned int service_time)
289 unsigned int nl, oldnl;
291 time64_t now = ktime_get_real_seconds();
293 LASSERT(req->rq_import);
295 if (service_time > now - req->rq_sent + 3) {
297 * bz16408, however, this can also happen if early reply
298 * is lost and client RPC is expired and resent, early reply
299 * or reply of original RPC can still be fit in reply buffer
300 * of resent RPC, now client is measuring time from the
301 * resent time, but server sent back service time of original
304 CDEBUG((lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT) ?
305 D_ADAPTTO : D_WARNING,
306 "Reported service time %u > total measured time "
307 CFS_DURATION_T"\n", service_time,
308 (long)(now - req->rq_sent));
312 /* Network latency is total time less server processing time */
313 nl = max_t(int, now - req->rq_sent -
314 service_time, 0) + 1; /* st rounding */
315 at = &req->rq_import->imp_at;
317 oldnl = at_measured(&at->iat_net_latency, nl);
319 CDEBUG(D_ADAPTTO, "The network latency for %s (nid %s) has changed from %d to %d\n",
320 req->rq_import->imp_obd->obd_name,
322 &req->rq_import->imp_connection->c_remote_uuid),
323 oldnl, at_get(&at->iat_net_latency));
326 static int unpack_reply(struct ptlrpc_request *req)
330 if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
331 rc = ptlrpc_unpack_rep_msg(req, req->rq_replen);
333 DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc);
338 rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
340 DEBUG_REQ(D_ERROR, req, "unpack ptlrpc body failed: %d", rc);
347 * Handle an early reply message, called with the rq_lock held.
348 * If anything goes wrong just ignore it - same as if it never happened
350 static int ptlrpc_at_recv_early_reply(struct ptlrpc_request *req)
351 __must_hold(&req->rq_lock)
353 struct ptlrpc_request *early_req;
358 spin_unlock(&req->rq_lock);
360 rc = sptlrpc_cli_unwrap_early_reply(req, &early_req);
362 spin_lock(&req->rq_lock);
366 rc = unpack_reply(early_req);
368 sptlrpc_cli_finish_early_reply(early_req);
369 spin_lock(&req->rq_lock);
374 * Use new timeout value just to adjust the local value for this
375 * request, don't include it into at_history. It is unclear yet why
376 * service time increased and should it be counted or skipped, e.g.
377 * that can be recovery case or some error or server, the real reply
378 * will add all new data if it is worth to add.
380 req->rq_timeout = lustre_msg_get_timeout(early_req->rq_repmsg);
381 lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
383 /* Network latency can be adjusted, it is pure network delays */
384 ptlrpc_at_adj_net_latency(req,
385 lustre_msg_get_service_time(early_req->rq_repmsg));
387 sptlrpc_cli_finish_early_reply(early_req);
389 spin_lock(&req->rq_lock);
390 olddl = req->rq_deadline;
392 * server assumes it now has rq_timeout from when the request
393 * arrived, so the client should give it at least that long.
394 * since we don't know the arrival time we'll use the original
397 req->rq_deadline = req->rq_sent + req->rq_timeout +
398 ptlrpc_at_get_net_latency(req);
400 DEBUG_REQ(D_ADAPTTO, req,
401 "Early reply #%d, new deadline in %lds (%lds)",
403 (long)(req->rq_deadline - ktime_get_real_seconds()),
404 (long)(req->rq_deadline - olddl));
409 static struct kmem_cache *request_cache;
411 int ptlrpc_request_cache_init(void)
413 request_cache = kmem_cache_create("ptlrpc_cache",
414 sizeof(struct ptlrpc_request),
415 0, SLAB_HWCACHE_ALIGN, NULL);
416 return !request_cache ? -ENOMEM : 0;
419 void ptlrpc_request_cache_fini(void)
421 kmem_cache_destroy(request_cache);
424 struct ptlrpc_request *ptlrpc_request_cache_alloc(gfp_t flags)
426 struct ptlrpc_request *req;
428 req = kmem_cache_zalloc(request_cache, flags);
432 void ptlrpc_request_cache_free(struct ptlrpc_request *req)
434 kmem_cache_free(request_cache, req);
438 * Wind down request pool \a pool.
439 * Frees all requests from the pool too
441 void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool)
443 struct list_head *l, *tmp;
444 struct ptlrpc_request *req;
446 spin_lock(&pool->prp_lock);
447 list_for_each_safe(l, tmp, &pool->prp_req_list) {
448 req = list_entry(l, struct ptlrpc_request, rq_list);
449 list_del(&req->rq_list);
450 LASSERT(req->rq_reqbuf);
451 LASSERT(req->rq_reqbuf_len == pool->prp_rq_size);
452 kvfree(req->rq_reqbuf);
453 ptlrpc_request_cache_free(req);
455 spin_unlock(&pool->prp_lock);
458 EXPORT_SYMBOL(ptlrpc_free_rq_pool);
461 * Allocates, initializes and adds \a num_rq requests to the pool \a pool
463 int ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
468 while (size < pool->prp_rq_size)
471 LASSERTF(list_empty(&pool->prp_req_list) ||
472 size == pool->prp_rq_size,
473 "Trying to change pool size with nonempty pool from %d to %d bytes\n",
474 pool->prp_rq_size, size);
476 spin_lock(&pool->prp_lock);
477 pool->prp_rq_size = size;
478 for (i = 0; i < num_rq; i++) {
479 struct ptlrpc_request *req;
480 struct lustre_msg *msg;
482 spin_unlock(&pool->prp_lock);
483 req = ptlrpc_request_cache_alloc(GFP_NOFS);
486 msg = libcfs_kvzalloc(size, GFP_NOFS);
488 ptlrpc_request_cache_free(req);
491 req->rq_reqbuf = msg;
492 req->rq_reqbuf_len = size;
494 spin_lock(&pool->prp_lock);
495 list_add_tail(&req->rq_list, &pool->prp_req_list);
497 spin_unlock(&pool->prp_lock);
500 EXPORT_SYMBOL(ptlrpc_add_rqs_to_pool);
503 * Create and initialize new request pool with given attributes:
504 * \a num_rq - initial number of requests to create for the pool
505 * \a msgsize - maximum message size possible for requests in thid pool
506 * \a populate_pool - function to be called when more requests need to be added
508 * Returns pointer to newly created pool or NULL on error.
510 struct ptlrpc_request_pool *
511 ptlrpc_init_rq_pool(int num_rq, int msgsize,
512 int (*populate_pool)(struct ptlrpc_request_pool *, int))
514 struct ptlrpc_request_pool *pool;
516 pool = kzalloc(sizeof(struct ptlrpc_request_pool), GFP_NOFS);
521 * Request next power of two for the allocation, because internally
522 * kernel would do exactly this
525 spin_lock_init(&pool->prp_lock);
526 INIT_LIST_HEAD(&pool->prp_req_list);
527 pool->prp_rq_size = msgsize + SPTLRPC_MAX_PAYLOAD;
528 pool->prp_populate = populate_pool;
530 populate_pool(pool, num_rq);
534 EXPORT_SYMBOL(ptlrpc_init_rq_pool);
537 * Fetches one request from pool \a pool
539 static struct ptlrpc_request *
540 ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
542 struct ptlrpc_request *request;
543 struct lustre_msg *reqbuf;
548 spin_lock(&pool->prp_lock);
551 * See if we have anything in a pool, and bail out if nothing,
552 * in writeout path, where this matters, this is safe to do, because
553 * nothing is lost in this case, and when some in-flight requests
554 * complete, this code will be called again.
556 if (unlikely(list_empty(&pool->prp_req_list))) {
557 spin_unlock(&pool->prp_lock);
561 request = list_entry(pool->prp_req_list.next, struct ptlrpc_request,
563 list_del_init(&request->rq_list);
564 spin_unlock(&pool->prp_lock);
566 LASSERT(request->rq_reqbuf);
567 LASSERT(request->rq_pool);
569 reqbuf = request->rq_reqbuf;
570 memset(request, 0, sizeof(*request));
571 request->rq_reqbuf = reqbuf;
572 request->rq_reqbuf_len = pool->prp_rq_size;
573 request->rq_pool = pool;
579 * Returns freed \a request to pool.
581 static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
583 struct ptlrpc_request_pool *pool = request->rq_pool;
585 spin_lock(&pool->prp_lock);
586 LASSERT(list_empty(&request->rq_list));
587 LASSERT(!request->rq_receiving_reply);
588 list_add_tail(&request->rq_list, &pool->prp_req_list);
589 spin_unlock(&pool->prp_lock);
592 int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
593 __u32 version, int opcode, char **bufs,
594 struct ptlrpc_cli_ctx *ctx)
597 struct obd_import *imp;
601 count = req_capsule_filled_sizes(&request->rq_pill, RCL_CLIENT);
602 imp = request->rq_import;
603 lengths = request->rq_pill.rc_area[RCL_CLIENT];
606 request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx);
608 rc = sptlrpc_req_get_ctx(request);
612 sptlrpc_req_set_flavor(request, opcode);
614 rc = lustre_pack_request(request, imp->imp_msg_magic, count,
619 lustre_msg_add_version(request->rq_reqmsg, version);
620 request->rq_send_state = LUSTRE_IMP_FULL;
621 request->rq_type = PTL_RPC_MSG_REQUEST;
623 request->rq_req_cbid.cbid_fn = request_out_callback;
624 request->rq_req_cbid.cbid_arg = request;
626 request->rq_reply_cbid.cbid_fn = reply_in_callback;
627 request->rq_reply_cbid.cbid_arg = request;
629 request->rq_reply_deadline = 0;
630 request->rq_bulk_deadline = 0;
631 request->rq_req_deadline = 0;
632 request->rq_phase = RQ_PHASE_NEW;
633 request->rq_next_phase = RQ_PHASE_UNDEFINED;
635 request->rq_request_portal = imp->imp_client->cli_request_portal;
636 request->rq_reply_portal = imp->imp_client->cli_reply_portal;
638 ptlrpc_at_set_req_timeout(request);
640 request->rq_xid = ptlrpc_next_xid();
641 lustre_msg_set_opc(request->rq_reqmsg, opcode);
643 /* Let's setup deadline for req/reply/bulk unlink for opcode. */
644 if (cfs_fail_val == opcode) {
645 time_t *fail_t = NULL, *fail2_t = NULL;
647 if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK)) {
648 fail_t = &request->rq_bulk_deadline;
649 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
650 fail_t = &request->rq_reply_deadline;
651 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REQ_UNLINK)) {
652 fail_t = &request->rq_req_deadline;
653 } else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BOTH_UNLINK)) {
654 fail_t = &request->rq_reply_deadline;
655 fail2_t = &request->rq_bulk_deadline;
659 *fail_t = ktime_get_real_seconds() + LONG_UNLINK;
662 *fail2_t = ktime_get_real_seconds() +
665 /* The RPC is infected, let the test change the
668 set_current_state(TASK_UNINTERRUPTIBLE);
669 schedule_timeout(cfs_time_seconds(2));
670 set_current_state(TASK_RUNNING);
677 LASSERT(!request->rq_pool);
678 sptlrpc_cli_ctx_put(request->rq_cli_ctx, 1);
680 class_import_put(imp);
683 EXPORT_SYMBOL(ptlrpc_request_bufs_pack);
686 * Pack request buffers for network transfer, performing necessary encryption
687 * steps if necessary.
689 int ptlrpc_request_pack(struct ptlrpc_request *request,
690 __u32 version, int opcode)
694 rc = ptlrpc_request_bufs_pack(request, version, opcode, NULL, NULL);
699 * For some old 1.8 clients (< 1.8.7), they will LASSERT the size of
700 * ptlrpc_body sent from server equal to local ptlrpc_body size, so we
701 * have to send old ptlrpc_body to keep interoperability with these
704 * Only three kinds of server->client RPCs so far:
709 * XXX This should be removed whenever we drop the interoperability with
710 * the these old clients.
712 if (opcode == LDLM_BL_CALLBACK || opcode == LDLM_CP_CALLBACK ||
713 opcode == LDLM_GL_CALLBACK)
714 req_capsule_shrink(&request->rq_pill, &RMF_PTLRPC_BODY,
715 sizeof(struct ptlrpc_body_v2), RCL_CLIENT);
719 EXPORT_SYMBOL(ptlrpc_request_pack);
722 * Helper function to allocate new request on import \a imp
723 * and possibly using existing request from pool \a pool if provided.
724 * Returns allocated request structure with import field filled or
728 struct ptlrpc_request *__ptlrpc_request_alloc(struct obd_import *imp,
729 struct ptlrpc_request_pool *pool)
731 struct ptlrpc_request *request;
733 request = ptlrpc_request_cache_alloc(GFP_NOFS);
735 if (!request && pool)
736 request = ptlrpc_prep_req_from_pool(pool);
739 ptlrpc_cli_req_init(request);
741 LASSERTF((unsigned long)imp > 0x1000, "%p", imp);
742 LASSERT(imp != LP_POISON);
743 LASSERTF((unsigned long)imp->imp_client > 0x1000, "%p\n",
745 LASSERT(imp->imp_client != LP_POISON);
747 request->rq_import = class_import_get(imp);
749 CERROR("request allocation out of memory\n");
756 * Helper function for creating a request.
757 * Calls __ptlrpc_request_alloc to allocate new request structure and inits
758 * buffer structures according to capsule template \a format.
759 * Returns allocated request structure pointer or NULL on error.
761 static struct ptlrpc_request *
762 ptlrpc_request_alloc_internal(struct obd_import *imp,
763 struct ptlrpc_request_pool *pool,
764 const struct req_format *format)
766 struct ptlrpc_request *request;
768 request = __ptlrpc_request_alloc(imp, pool);
772 req_capsule_init(&request->rq_pill, request, RCL_CLIENT);
773 req_capsule_set(&request->rq_pill, format);
778 * Allocate new request structure for import \a imp and initialize its
779 * buffer structure according to capsule template \a format.
781 struct ptlrpc_request *ptlrpc_request_alloc(struct obd_import *imp,
782 const struct req_format *format)
784 return ptlrpc_request_alloc_internal(imp, NULL, format);
786 EXPORT_SYMBOL(ptlrpc_request_alloc);
789 * Allocate new request structure for import \a imp from pool \a pool and
790 * initialize its buffer structure according to capsule template \a format.
792 struct ptlrpc_request *ptlrpc_request_alloc_pool(struct obd_import *imp,
793 struct ptlrpc_request_pool *pool,
794 const struct req_format *format)
796 return ptlrpc_request_alloc_internal(imp, pool, format);
798 EXPORT_SYMBOL(ptlrpc_request_alloc_pool);
801 * For requests not from pool, free memory of the request structure.
802 * For requests obtained from a pool earlier, return request back to pool.
804 void ptlrpc_request_free(struct ptlrpc_request *request)
806 if (request->rq_pool)
807 __ptlrpc_free_req_to_pool(request);
809 ptlrpc_request_cache_free(request);
811 EXPORT_SYMBOL(ptlrpc_request_free);
814 * Allocate new request for operation \a opcode and immediately pack it for
816 * Only used for simple requests like OBD_PING where the only important
817 * part of the request is operation itself.
818 * Returns allocated request or NULL on error.
820 struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp,
821 const struct req_format *format,
822 __u32 version, int opcode)
824 struct ptlrpc_request *req = ptlrpc_request_alloc(imp, format);
828 rc = ptlrpc_request_pack(req, version, opcode);
830 ptlrpc_request_free(req);
836 EXPORT_SYMBOL(ptlrpc_request_alloc_pack);
839 * Allocate and initialize new request set structure on the current CPT.
840 * Returns a pointer to the newly allocated set structure or NULL on error.
842 struct ptlrpc_request_set *ptlrpc_prep_set(void)
844 struct ptlrpc_request_set *set;
847 cpt = cfs_cpt_current(cfs_cpt_table, 0);
848 set = kzalloc_node(sizeof(*set), GFP_NOFS,
849 cfs_cpt_spread_node(cfs_cpt_table, cpt));
852 atomic_set(&set->set_refcount, 1);
853 INIT_LIST_HEAD(&set->set_requests);
854 init_waitqueue_head(&set->set_waitq);
855 atomic_set(&set->set_new_count, 0);
856 atomic_set(&set->set_remaining, 0);
857 spin_lock_init(&set->set_new_req_lock);
858 INIT_LIST_HEAD(&set->set_new_requests);
859 INIT_LIST_HEAD(&set->set_cblist);
860 set->set_max_inflight = UINT_MAX;
861 set->set_producer = NULL;
862 set->set_producer_arg = NULL;
867 EXPORT_SYMBOL(ptlrpc_prep_set);
870 * Allocate and initialize new request set structure with flow control
871 * extension. This extension allows to control the number of requests in-flight
872 * for the whole set. A callback function to generate requests must be provided
873 * and the request set will keep the number of requests sent over the wire to
875 * Returns a pointer to the newly allocated set structure or NULL on error.
877 struct ptlrpc_request_set *ptlrpc_prep_fcset(int max, set_producer_func func,
881 struct ptlrpc_request_set *set;
883 set = ptlrpc_prep_set();
887 set->set_max_inflight = max;
888 set->set_producer = func;
889 set->set_producer_arg = arg;
895 * Wind down and free request set structure previously allocated with
897 * Ensures that all requests on the set have completed and removes
898 * all requests from the request list in a set.
899 * If any unsent request happen to be on the list, pretends that they got
900 * an error in flight and calls their completion handler.
902 void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
904 struct list_head *tmp;
905 struct list_head *next;
909 /* Requests on the set should either all be completed, or all be new */
910 expected_phase = (atomic_read(&set->set_remaining) == 0) ?
911 RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
912 list_for_each(tmp, &set->set_requests) {
913 struct ptlrpc_request *req =
914 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
916 LASSERT(req->rq_phase == expected_phase);
920 LASSERTF(atomic_read(&set->set_remaining) == 0 ||
921 atomic_read(&set->set_remaining) == n, "%d / %d\n",
922 atomic_read(&set->set_remaining), n);
924 list_for_each_safe(tmp, next, &set->set_requests) {
925 struct ptlrpc_request *req =
926 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
927 list_del_init(&req->rq_set_chain);
929 LASSERT(req->rq_phase == expected_phase);
931 if (req->rq_phase == RQ_PHASE_NEW) {
932 ptlrpc_req_interpret(NULL, req, -EBADR);
933 atomic_dec(&set->set_remaining);
936 spin_lock(&req->rq_lock);
938 req->rq_invalid_rqset = 0;
939 spin_unlock(&req->rq_lock);
941 ptlrpc_req_finished(req);
944 LASSERT(atomic_read(&set->set_remaining) == 0);
946 ptlrpc_reqset_put(set);
948 EXPORT_SYMBOL(ptlrpc_set_destroy);
951 * Add a new request to the general purpose request set.
952 * Assumes request reference from the caller.
954 void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
955 struct ptlrpc_request *req)
957 LASSERT(list_empty(&req->rq_set_chain));
959 /* The set takes over the caller's request reference */
960 list_add_tail(&req->rq_set_chain, &set->set_requests);
962 atomic_inc(&set->set_remaining);
963 req->rq_queued_time = cfs_time_current();
966 lustre_msg_set_jobid(req->rq_reqmsg, NULL);
968 if (set->set_producer)
970 * If the request set has a producer callback, the RPC must be
973 ptlrpc_send_new_req(req);
975 EXPORT_SYMBOL(ptlrpc_set_add_req);
978 * Add a request to a request with dedicated server thread
979 * and wake the thread to make any necessary processing.
980 * Currently only used for ptlrpcd.
982 void ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc,
983 struct ptlrpc_request *req)
985 struct ptlrpc_request_set *set = pc->pc_set;
988 LASSERT(!req->rq_set);
989 LASSERT(test_bit(LIOD_STOP, &pc->pc_flags) == 0);
991 spin_lock(&set->set_new_req_lock);
992 /* The set takes over the caller's request reference. */
994 req->rq_queued_time = cfs_time_current();
995 list_add_tail(&req->rq_set_chain, &set->set_new_requests);
996 count = atomic_inc_return(&set->set_new_count);
997 spin_unlock(&set->set_new_req_lock);
999 /* Only need to call wakeup once for the first entry. */
1001 wake_up(&set->set_waitq);
1004 * XXX: It maybe unnecessary to wakeup all the partners. But to
1005 * guarantee the async RPC can be processed ASAP, we have
1006 * no other better choice. It maybe fixed in future.
1008 for (i = 0; i < pc->pc_npartners; i++)
1009 wake_up(&pc->pc_partners[i]->pc_set->set_waitq);
1014 * Based on the current state of the import, determine if the request
1015 * can be sent, is an error, or should be delayed.
1017 * Returns true if this request should be delayed. If false, and
1018 * *status is set, then the request can not be sent and *status is the
1019 * error code. If false and status is 0, then request can be sent.
1021 * The imp->imp_lock must be held.
1023 static int ptlrpc_import_delay_req(struct obd_import *imp,
1024 struct ptlrpc_request *req, int *status)
1030 if (req->rq_ctx_init || req->rq_ctx_fini) {
1031 /* always allow ctx init/fini rpc go through */
1032 } else if (imp->imp_state == LUSTRE_IMP_NEW) {
1033 DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
1035 } else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
1036 /* pings may safely race with umount */
1037 DEBUG_REQ(lustre_msg_get_opc(req->rq_reqmsg) == OBD_PING ?
1038 D_HA : D_ERROR, req, "IMP_CLOSED ");
1040 } else if (ptlrpc_send_limit_expired(req)) {
1041 /* probably doesn't need to be a D_ERROR after initial testing */
1042 DEBUG_REQ(D_HA, req, "send limit expired ");
1043 *status = -ETIMEDOUT;
1044 } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
1045 imp->imp_state == LUSTRE_IMP_CONNECTING) {
1046 /* allow CONNECT even if import is invalid */
1047 if (atomic_read(&imp->imp_inval_count) != 0) {
1048 DEBUG_REQ(D_ERROR, req, "invalidate in flight");
1051 } else if (imp->imp_invalid || imp->imp_obd->obd_no_recov) {
1052 if (!imp->imp_deactive)
1053 DEBUG_REQ(D_NET, req, "IMP_INVALID");
1054 *status = -ESHUTDOWN; /* bz 12940 */
1055 } else if (req->rq_import_generation != imp->imp_generation) {
1056 DEBUG_REQ(D_ERROR, req, "req wrong generation:");
1058 } else if (req->rq_send_state != imp->imp_state) {
1059 /* invalidate in progress - any requests should be drop */
1060 if (atomic_read(&imp->imp_inval_count) != 0) {
1061 DEBUG_REQ(D_ERROR, req, "invalidate in flight");
1063 } else if (imp->imp_dlm_fake || req->rq_no_delay) {
1064 *status = -EWOULDBLOCK;
1065 } else if (req->rq_allow_replay &&
1066 (imp->imp_state == LUSTRE_IMP_REPLAY ||
1067 imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS ||
1068 imp->imp_state == LUSTRE_IMP_REPLAY_WAIT ||
1069 imp->imp_state == LUSTRE_IMP_RECOVER)) {
1070 DEBUG_REQ(D_HA, req, "allow during recovery.\n");
1080 * Decide if the error message should be printed to the console or not.
1081 * Makes its decision based on request type, status, and failure frequency.
1083 * \param[in] req request that failed and may need a console message
1085 * \retval false if no message should be printed
1086 * \retval true if console message should be printed
1088 static bool ptlrpc_console_allow(struct ptlrpc_request *req)
1092 LASSERT(req->rq_reqmsg);
1093 opc = lustre_msg_get_opc(req->rq_reqmsg);
1095 /* Suppress particular reconnect errors which are to be expected. */
1096 if (opc == OST_CONNECT || opc == MDS_CONNECT || opc == MGS_CONNECT) {
1099 /* Suppress timed out reconnect requests */
1100 if (lustre_handle_is_used(&req->rq_import->imp_remote_handle) ||
1105 * Suppress most unavailable/again reconnect requests, but
1106 * print occasionally so it is clear client is trying to
1107 * connect to a server where no target is running.
1109 err = lustre_msg_get_status(req->rq_repmsg);
1110 if ((err == -ENODEV || err == -EAGAIN) &&
1111 req->rq_import->imp_conn_cnt % 30 != 20)
1119 * Check request processing status.
1120 * Returns the status.
1122 static int ptlrpc_check_status(struct ptlrpc_request *req)
1126 err = lustre_msg_get_status(req->rq_repmsg);
1127 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
1128 struct obd_import *imp = req->rq_import;
1129 lnet_nid_t nid = imp->imp_connection->c_peer.nid;
1130 __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
1132 if (ptlrpc_console_allow(req))
1133 LCONSOLE_ERROR_MSG(0x011, "%s: operation %s to node %s failed: rc = %d\n",
1134 imp->imp_obd->obd_name,
1136 libcfs_nid2str(nid), err);
1137 return err < 0 ? err : -EINVAL;
1141 DEBUG_REQ(D_INFO, req, "status is %d", err);
1143 /* XXX: translate this error from net to host */
1144 DEBUG_REQ(D_INFO, req, "status is %d", err);
1150 * save pre-versions of objects into request for replay.
1151 * Versions are obtained from server reply.
1154 static void ptlrpc_save_versions(struct ptlrpc_request *req)
1156 struct lustre_msg *repmsg = req->rq_repmsg;
1157 struct lustre_msg *reqmsg = req->rq_reqmsg;
1158 __u64 *versions = lustre_msg_get_versions(repmsg);
1160 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
1164 lustre_msg_set_versions(reqmsg, versions);
1165 CDEBUG(D_INFO, "Client save versions [%#llx/%#llx]\n",
1166 versions[0], versions[1]);
1170 * Callback function called when client receives RPC reply for \a req.
1171 * Returns 0 on success or error code.
1172 * The return value would be assigned to req->rq_status by the caller
1173 * as request processing status.
1174 * This function also decides if the request needs to be saved for later replay.
1176 static int after_reply(struct ptlrpc_request *req)
1178 struct obd_import *imp = req->rq_import;
1179 struct obd_device *obd = req->rq_import->imp_obd;
1181 struct timespec64 work_start;
1185 /* repbuf must be unlinked */
1186 LASSERT(!req->rq_receiving_reply && req->rq_reply_unlinked);
1188 if (req->rq_reply_truncated) {
1189 if (ptlrpc_no_resend(req)) {
1190 DEBUG_REQ(D_ERROR, req, "reply buffer overflow, expected: %d, actual size: %d",
1191 req->rq_nob_received, req->rq_repbuf_len);
1195 sptlrpc_cli_free_repbuf(req);
1197 * Pass the required reply buffer size (include space for early
1198 * reply). NB: no need to round up because alloc_repbuf will
1201 req->rq_replen = req->rq_nob_received;
1202 req->rq_nob_received = 0;
1203 spin_lock(&req->rq_lock);
1205 spin_unlock(&req->rq_lock);
1210 * NB Until this point, the whole of the incoming message,
1211 * including buflens, status etc is in the sender's byte order.
1213 rc = sptlrpc_cli_unwrap_reply(req);
1215 DEBUG_REQ(D_ERROR, req, "unwrap reply failed (%d):", rc);
1219 /* Security layer unwrap might ask resend this request. */
1223 rc = unpack_reply(req);
1227 /* retry indefinitely on EINPROGRESS */
1228 if (lustre_msg_get_status(req->rq_repmsg) == -EINPROGRESS &&
1229 ptlrpc_no_resend(req) == 0 && !req->rq_no_retry_einprogress) {
1230 time64_t now = ktime_get_real_seconds();
1232 DEBUG_REQ(D_RPCTRACE, req, "Resending request on EINPROGRESS");
1233 spin_lock(&req->rq_lock);
1235 spin_unlock(&req->rq_lock);
1236 req->rq_nr_resend++;
1238 /* allocate new xid to avoid reply reconstruction */
1239 if (!req->rq_bulk) {
1240 /* new xid is already allocated for bulk in ptlrpc_check_set() */
1241 req->rq_xid = ptlrpc_next_xid();
1242 DEBUG_REQ(D_RPCTRACE, req, "Allocating new xid for resend on EINPROGRESS");
1245 /* Readjust the timeout for current conditions */
1246 ptlrpc_at_set_req_timeout(req);
1248 * delay resend to give a chance to the server to get ready.
1249 * The delay is increased by 1s on every resend and is capped to
1250 * the current request timeout (i.e. obd_timeout if AT is off,
1251 * or AT service time x 125% + 5s, see at_est2timeout)
1253 if (req->rq_nr_resend > req->rq_timeout)
1254 req->rq_sent = now + req->rq_timeout;
1256 req->rq_sent = now + req->rq_nr_resend;
1261 ktime_get_real_ts64(&work_start);
1262 timediff = (work_start.tv_sec - req->rq_sent_tv.tv_sec) * USEC_PER_SEC +
1263 (work_start.tv_nsec - req->rq_sent_tv.tv_nsec) /
1265 if (obd->obd_svc_stats) {
1266 lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR,
1268 ptlrpc_lprocfs_rpc_sent(req, timediff);
1271 if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
1272 lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
1273 DEBUG_REQ(D_ERROR, req, "invalid packet received (type=%u)",
1274 lustre_msg_get_type(req->rq_repmsg));
1278 if (lustre_msg_get_opc(req->rq_reqmsg) != OBD_PING)
1279 CFS_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_PAUSE_REP, cfs_fail_val);
1280 ptlrpc_at_adj_service(req, lustre_msg_get_timeout(req->rq_repmsg));
1281 ptlrpc_at_adj_net_latency(req,
1282 lustre_msg_get_service_time(req->rq_repmsg));
1284 rc = ptlrpc_check_status(req);
1285 imp->imp_connect_error = rc;
1289 * Either we've been evicted, or the server has failed for
1290 * some reason. Try to reconnect, and if that fails, punt to
1293 if (ptlrpc_recoverable_error(rc)) {
1294 if (req->rq_send_state != LUSTRE_IMP_FULL ||
1295 imp->imp_obd->obd_no_recov || imp->imp_dlm_fake) {
1298 ptlrpc_request_handle_notconn(req);
1303 * Let's look if server sent slv. Do it only for RPC with
1306 ldlm_cli_update_pool(req);
1309 /* Store transno in reqmsg for replay. */
1310 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)) {
1311 req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
1312 lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
1315 if (imp->imp_replayable) {
1316 spin_lock(&imp->imp_lock);
1318 * No point in adding already-committed requests to the replay
1319 * list, we will just remove them immediately. b=9829
1321 if (req->rq_transno != 0 &&
1323 lustre_msg_get_last_committed(req->rq_repmsg) ||
1325 /* version recovery */
1326 ptlrpc_save_versions(req);
1327 ptlrpc_retain_replayable_request(req, imp);
1328 } else if (req->rq_commit_cb &&
1329 list_empty(&req->rq_replay_list)) {
1331 * NB: don't call rq_commit_cb if it's already on
1332 * rq_replay_list, ptlrpc_free_committed() will call
1333 * it later, see LU-3618 for details
1335 spin_unlock(&imp->imp_lock);
1336 req->rq_commit_cb(req);
1337 spin_lock(&imp->imp_lock);
1340 /* Replay-enabled imports return commit-status information. */
1341 if (lustre_msg_get_last_committed(req->rq_repmsg)) {
1342 imp->imp_peer_committed_transno =
1343 lustre_msg_get_last_committed(req->rq_repmsg);
1346 ptlrpc_free_committed(imp);
1348 if (!list_empty(&imp->imp_replay_list)) {
1349 struct ptlrpc_request *last;
1351 last = list_entry(imp->imp_replay_list.prev,
1352 struct ptlrpc_request,
1355 * Requests with rq_replay stay on the list even if no
1356 * commit is expected.
1358 if (last->rq_transno > imp->imp_peer_committed_transno)
1359 ptlrpc_pinger_commit_expected(imp);
1362 spin_unlock(&imp->imp_lock);
1369 * Helper function to send request \a req over the network for the first time
1370 * Also adjusts request phase.
1371 * Returns 0 on success or error code.
1373 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
1375 struct obd_import *imp = req->rq_import;
1378 LASSERT(req->rq_phase == RQ_PHASE_NEW);
1379 if (req->rq_sent && (req->rq_sent > ktime_get_real_seconds()) &&
1380 (!req->rq_generation_set ||
1381 req->rq_import_generation == imp->imp_generation))
1384 ptlrpc_rqphase_move(req, RQ_PHASE_RPC);
1386 spin_lock(&imp->imp_lock);
1388 if (!req->rq_generation_set)
1389 req->rq_import_generation = imp->imp_generation;
1391 if (ptlrpc_import_delay_req(imp, req, &rc)) {
1392 spin_lock(&req->rq_lock);
1393 req->rq_waiting = 1;
1394 spin_unlock(&req->rq_lock);
1396 DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: (%s != %s)",
1397 lustre_msg_get_status(req->rq_reqmsg),
1398 ptlrpc_import_state_name(req->rq_send_state),
1399 ptlrpc_import_state_name(imp->imp_state));
1400 LASSERT(list_empty(&req->rq_list));
1401 list_add_tail(&req->rq_list, &imp->imp_delayed_list);
1402 atomic_inc(&req->rq_import->imp_inflight);
1403 spin_unlock(&imp->imp_lock);
1408 spin_unlock(&imp->imp_lock);
1409 req->rq_status = rc;
1410 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1414 LASSERT(list_empty(&req->rq_list));
1415 list_add_tail(&req->rq_list, &imp->imp_sending_list);
1416 atomic_inc(&req->rq_import->imp_inflight);
1417 spin_unlock(&imp->imp_lock);
1419 lustre_msg_set_status(req->rq_reqmsg, current_pid());
1421 rc = sptlrpc_req_refresh_ctx(req, -1);
1424 req->rq_status = rc;
1427 spin_lock(&req->rq_lock);
1428 req->rq_wait_ctx = 1;
1429 spin_unlock(&req->rq_lock);
1433 CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc %s:%s:%d:%llu:%s:%d\n",
1435 imp->imp_obd->obd_uuid.uuid,
1436 lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1437 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1438 lustre_msg_get_opc(req->rq_reqmsg));
1440 rc = ptl_send_rpc(req, 0);
1442 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
1443 spin_lock(&req->rq_lock);
1444 req->rq_net_err = 1;
1445 spin_unlock(&req->rq_lock);
1451 static inline int ptlrpc_set_producer(struct ptlrpc_request_set *set)
1455 LASSERT(set->set_producer);
1457 remaining = atomic_read(&set->set_remaining);
1460 * populate the ->set_requests list with requests until we
1461 * reach the maximum number of RPCs in flight for this set
1463 while (atomic_read(&set->set_remaining) < set->set_max_inflight) {
1464 rc = set->set_producer(set, set->set_producer_arg);
1465 if (rc == -ENOENT) {
1466 /* no more RPC to produce */
1467 set->set_producer = NULL;
1468 set->set_producer_arg = NULL;
1473 return (atomic_read(&set->set_remaining) - remaining);
1477 * this sends any unsent RPCs in \a set and returns 1 if all are sent
1478 * and no more replies are expected.
1479 * (it is possible to get less replies than requests sent e.g. due to timed out
1480 * requests or requests that we had trouble to send out)
1482 * NOTE: This function contains a potential schedule point (cond_resched()).
1484 int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
1486 struct list_head *tmp, *next;
1487 struct list_head comp_reqs;
1488 int force_timer_recalc = 0;
1490 if (atomic_read(&set->set_remaining) == 0)
1493 INIT_LIST_HEAD(&comp_reqs);
1494 list_for_each_safe(tmp, next, &set->set_requests) {
1495 struct ptlrpc_request *req =
1496 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1497 struct obd_import *imp = req->rq_import;
1498 int unregistered = 0;
1502 * This schedule point is mainly for the ptlrpcd caller of this
1503 * function. Most ptlrpc sets are not long-lived and unbounded
1504 * in length, but at the least the set used by the ptlrpcd is.
1505 * Since the processing time is unbounded, we need to insert an
1506 * explicit schedule point to make the thread well-behaved.
1510 if (req->rq_phase == RQ_PHASE_NEW &&
1511 ptlrpc_send_new_req(req)) {
1512 force_timer_recalc = 1;
1515 /* delayed send - skip */
1516 if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
1519 /* delayed resend - skip */
1520 if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend &&
1521 req->rq_sent > ktime_get_real_seconds())
1524 if (!(req->rq_phase == RQ_PHASE_RPC ||
1525 req->rq_phase == RQ_PHASE_BULK ||
1526 req->rq_phase == RQ_PHASE_INTERPRET ||
1527 req->rq_phase == RQ_PHASE_UNREG_RPC ||
1528 req->rq_phase == RQ_PHASE_UNREG_BULK ||
1529 req->rq_phase == RQ_PHASE_COMPLETE)) {
1530 DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
1534 if (req->rq_phase == RQ_PHASE_UNREG_RPC ||
1535 req->rq_phase == RQ_PHASE_UNREG_BULK) {
1536 LASSERT(req->rq_next_phase != req->rq_phase);
1537 LASSERT(req->rq_next_phase != RQ_PHASE_UNDEFINED);
1539 if (req->rq_req_deadline &&
1540 !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REQ_UNLINK))
1541 req->rq_req_deadline = 0;
1542 if (req->rq_reply_deadline &&
1543 !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK))
1544 req->rq_reply_deadline = 0;
1545 if (req->rq_bulk_deadline &&
1546 !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK))
1547 req->rq_bulk_deadline = 0;
1550 * Skip processing until reply is unlinked. We
1551 * can't return to pool before that and we can't
1552 * call interpret before that. We need to make
1553 * sure that all rdma transfers finished and will
1554 * not corrupt any data.
1556 if (req->rq_phase == RQ_PHASE_UNREG_RPC &&
1557 ptlrpc_client_recv_or_unlink(req))
1559 if (req->rq_phase == RQ_PHASE_UNREG_BULK &&
1560 ptlrpc_client_bulk_active(req))
1564 * Turn fail_loc off to prevent it from looping
1567 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
1568 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK,
1571 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK)) {
1572 OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK,
1576 /* Move to next phase if reply was successfully
1579 ptlrpc_rqphase_move(req, req->rq_next_phase);
1582 if (req->rq_phase == RQ_PHASE_COMPLETE) {
1583 list_move_tail(&req->rq_set_chain, &comp_reqs);
1587 if (req->rq_phase == RQ_PHASE_INTERPRET)
1590 /* Note that this also will start async reply unlink. */
1591 if (req->rq_net_err && !req->rq_timedout) {
1592 ptlrpc_expire_one_request(req, 1);
1594 /* Check if we still need to wait for unlink. */
1595 if (ptlrpc_client_recv_or_unlink(req) ||
1596 ptlrpc_client_bulk_active(req))
1598 /* If there is no need to resend, fail it now. */
1599 if (req->rq_no_resend) {
1600 if (req->rq_status == 0)
1601 req->rq_status = -EIO;
1602 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1610 spin_lock(&req->rq_lock);
1611 req->rq_replied = 0;
1612 spin_unlock(&req->rq_lock);
1613 if (req->rq_status == 0)
1614 req->rq_status = -EIO;
1615 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1620 * ptlrpc_set_wait->l_wait_event sets lwi_allow_intr
1621 * so it sets rq_intr regardless of individual rpc
1622 * timeouts. The synchronous IO waiting path sets
1623 * rq_intr irrespective of whether ptlrpcd
1624 * has seen a timeout. Our policy is to only interpret
1625 * interrupted rpcs after they have timed out, so we
1626 * need to enforce that here.
1629 if (req->rq_intr && (req->rq_timedout || req->rq_waiting ||
1630 req->rq_wait_ctx)) {
1631 req->rq_status = -EINTR;
1632 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1636 if (req->rq_phase == RQ_PHASE_RPC) {
1637 if (req->rq_timedout || req->rq_resend ||
1638 req->rq_waiting || req->rq_wait_ctx) {
1641 if (!ptlrpc_unregister_reply(req, 1)) {
1642 ptlrpc_unregister_bulk(req, 1);
1646 spin_lock(&imp->imp_lock);
1647 if (ptlrpc_import_delay_req(imp, req,
1650 * put on delay list - only if we wait
1651 * recovery finished - before send
1653 list_del_init(&req->rq_list);
1654 list_add_tail(&req->rq_list,
1655 &imp->imp_delayed_list);
1656 spin_unlock(&imp->imp_lock);
1661 req->rq_status = status;
1662 ptlrpc_rqphase_move(req,
1663 RQ_PHASE_INTERPRET);
1664 spin_unlock(&imp->imp_lock);
1667 if (ptlrpc_no_resend(req) &&
1668 !req->rq_wait_ctx) {
1669 req->rq_status = -ENOTCONN;
1670 ptlrpc_rqphase_move(req,
1671 RQ_PHASE_INTERPRET);
1672 spin_unlock(&imp->imp_lock);
1676 list_del_init(&req->rq_list);
1677 list_add_tail(&req->rq_list,
1678 &imp->imp_sending_list);
1680 spin_unlock(&imp->imp_lock);
1682 spin_lock(&req->rq_lock);
1683 req->rq_waiting = 0;
1684 spin_unlock(&req->rq_lock);
1686 if (req->rq_timedout || req->rq_resend) {
1687 /* This is re-sending anyway, let's mark req as resend. */
1688 spin_lock(&req->rq_lock);
1690 spin_unlock(&req->rq_lock);
1694 if (!ptlrpc_unregister_bulk(req, 1))
1697 /* ensure previous bulk fails */
1698 old_xid = req->rq_xid;
1699 req->rq_xid = ptlrpc_next_xid();
1700 CDEBUG(D_HA, "resend bulk old x%llu new x%llu\n",
1701 old_xid, req->rq_xid);
1705 * rq_wait_ctx is only touched by ptlrpcd,
1706 * so no lock is needed here.
1708 status = sptlrpc_req_refresh_ctx(req, -1);
1711 req->rq_status = status;
1712 spin_lock(&req->rq_lock);
1713 req->rq_wait_ctx = 0;
1714 spin_unlock(&req->rq_lock);
1715 force_timer_recalc = 1;
1717 spin_lock(&req->rq_lock);
1718 req->rq_wait_ctx = 1;
1719 spin_unlock(&req->rq_lock);
1724 spin_lock(&req->rq_lock);
1725 req->rq_wait_ctx = 0;
1726 spin_unlock(&req->rq_lock);
1729 rc = ptl_send_rpc(req, 0);
1731 DEBUG_REQ(D_HA, req,
1732 "send failed: rc = %d", rc);
1733 force_timer_recalc = 1;
1734 spin_lock(&req->rq_lock);
1735 req->rq_net_err = 1;
1736 spin_unlock(&req->rq_lock);
1739 /* need to reset the timeout */
1740 force_timer_recalc = 1;
1743 spin_lock(&req->rq_lock);
1745 if (ptlrpc_client_early(req)) {
1746 ptlrpc_at_recv_early_reply(req);
1747 spin_unlock(&req->rq_lock);
1751 /* Still waiting for a reply? */
1752 if (ptlrpc_client_recv(req)) {
1753 spin_unlock(&req->rq_lock);
1757 /* Did we actually receive a reply? */
1758 if (!ptlrpc_client_replied(req)) {
1759 spin_unlock(&req->rq_lock);
1763 spin_unlock(&req->rq_lock);
1766 * unlink from net because we are going to
1767 * swab in-place of reply buffer
1769 unregistered = ptlrpc_unregister_reply(req, 1);
1773 req->rq_status = after_reply(req);
1778 * If there is no bulk associated with this request,
1779 * then we're done and should let the interpreter
1780 * process the reply. Similarly if the RPC returned
1781 * an error, and therefore the bulk will never arrive.
1783 if (!req->rq_bulk || req->rq_status < 0) {
1784 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1788 ptlrpc_rqphase_move(req, RQ_PHASE_BULK);
1791 LASSERT(req->rq_phase == RQ_PHASE_BULK);
1792 if (ptlrpc_client_bulk_active(req))
1795 if (req->rq_bulk->bd_failure) {
1797 * The RPC reply arrived OK, but the bulk screwed
1798 * up! Dead weird since the server told us the RPC
1799 * was good after getting the REPLY for her GET or
1800 * the ACK for her PUT.
1802 DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
1803 req->rq_status = -EIO;
1806 ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
1809 LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
1812 * This moves to "unregistering" phase we need to wait for
1815 if (!unregistered && !ptlrpc_unregister_reply(req, 1)) {
1816 /* start async bulk unlink too */
1817 ptlrpc_unregister_bulk(req, 1);
1821 if (!ptlrpc_unregister_bulk(req, 1))
1824 /* When calling interpret receive should already be finished. */
1825 LASSERT(!req->rq_receiving_reply);
1827 ptlrpc_req_interpret(env, req, req->rq_status);
1829 if (ptlrpcd_check_work(req)) {
1830 atomic_dec(&set->set_remaining);
1833 ptlrpc_rqphase_move(req, RQ_PHASE_COMPLETE);
1835 CDEBUG(req->rq_reqmsg ? D_RPCTRACE : 0,
1836 "Completed RPC pname:cluuid:pid:xid:nid:opc %s:%s:%d:%llu:%s:%d\n",
1837 current_comm(), imp->imp_obd->obd_uuid.uuid,
1838 lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
1839 libcfs_nid2str(imp->imp_connection->c_peer.nid),
1840 lustre_msg_get_opc(req->rq_reqmsg));
1842 spin_lock(&imp->imp_lock);
1844 * Request already may be not on sending or delaying list. This
1845 * may happen in the case of marking it erroneous for the case
1846 * ptlrpc_import_delay_req(req, status) find it impossible to
1847 * allow sending this rpc and returns *status != 0.
1849 if (!list_empty(&req->rq_list)) {
1850 list_del_init(&req->rq_list);
1851 atomic_dec(&imp->imp_inflight);
1853 spin_unlock(&imp->imp_lock);
1855 atomic_dec(&set->set_remaining);
1856 wake_up_all(&imp->imp_recovery_waitq);
1858 if (set->set_producer) {
1859 /* produce a new request if possible */
1860 if (ptlrpc_set_producer(set) > 0)
1861 force_timer_recalc = 1;
1864 * free the request that has just been completed
1865 * in order not to pollute set->set_requests
1867 list_del_init(&req->rq_set_chain);
1868 spin_lock(&req->rq_lock);
1870 req->rq_invalid_rqset = 0;
1871 spin_unlock(&req->rq_lock);
1873 /* record rq_status to compute the final status later */
1874 if (req->rq_status != 0)
1875 set->set_rc = req->rq_status;
1876 ptlrpc_req_finished(req);
1878 list_move_tail(&req->rq_set_chain, &comp_reqs);
1883 * move completed request at the head of list so it's easier for
1884 * caller to find them
1886 list_splice(&comp_reqs, &set->set_requests);
1888 /* If we hit an error, we want to recover promptly. */
1889 return atomic_read(&set->set_remaining) == 0 || force_timer_recalc;
1891 EXPORT_SYMBOL(ptlrpc_check_set);
1894 * Time out request \a req. is \a async_unlink is set, that means do not wait
1895 * until LNet actually confirms network buffer unlinking.
1896 * Return 1 if we should give up further retrying attempts or 0 otherwise.
1898 int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink)
1900 struct obd_import *imp = req->rq_import;
1903 spin_lock(&req->rq_lock);
1904 req->rq_timedout = 1;
1905 spin_unlock(&req->rq_lock);
1907 DEBUG_REQ(D_WARNING, req, "Request sent has %s: [sent %lld/real %lld]",
1908 req->rq_net_err ? "failed due to network error" :
1909 ((req->rq_real_sent == 0 ||
1910 req->rq_real_sent < req->rq_sent ||
1911 req->rq_real_sent >= req->rq_deadline) ?
1912 "timed out for sent delay" : "timed out for slow reply"),
1913 (s64)req->rq_sent, (s64)req->rq_real_sent);
1915 if (imp && obd_debug_peer_on_timeout)
1916 LNetDebugPeer(imp->imp_connection->c_peer);
1918 ptlrpc_unregister_reply(req, async_unlink);
1919 ptlrpc_unregister_bulk(req, async_unlink);
1921 if (obd_dump_on_timeout)
1922 libcfs_debug_dumplog();
1925 DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
1929 atomic_inc(&imp->imp_timeouts);
1931 /* The DLM server doesn't want recovery run on its imports. */
1932 if (imp->imp_dlm_fake)
1936 * If this request is for recovery or other primordial tasks,
1937 * then error it out here.
1939 if (req->rq_ctx_init || req->rq_ctx_fini ||
1940 req->rq_send_state != LUSTRE_IMP_FULL ||
1941 imp->imp_obd->obd_no_recov) {
1942 DEBUG_REQ(D_RPCTRACE, req, "err -110, sent_state=%s (now=%s)",
1943 ptlrpc_import_state_name(req->rq_send_state),
1944 ptlrpc_import_state_name(imp->imp_state));
1945 spin_lock(&req->rq_lock);
1946 req->rq_status = -ETIMEDOUT;
1948 spin_unlock(&req->rq_lock);
1953 * if a request can't be resent we can't wait for an answer after
1956 if (ptlrpc_no_resend(req)) {
1957 DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:");
1961 ptlrpc_fail_import(imp, lustre_msg_get_conn_cnt(req->rq_reqmsg));
1967 * Time out all uncompleted requests in request set pointed by \a data
1968 * Callback used when waiting on sets with l_wait_event.
1971 int ptlrpc_expired_set(void *data)
1973 struct ptlrpc_request_set *set = data;
1974 struct list_head *tmp;
1975 time64_t now = ktime_get_real_seconds();
1977 /* A timeout expired. See which reqs it applies to... */
1978 list_for_each(tmp, &set->set_requests) {
1979 struct ptlrpc_request *req =
1980 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
1982 /* don't expire request waiting for context */
1983 if (req->rq_wait_ctx)
1986 /* Request in-flight? */
1987 if (!((req->rq_phase == RQ_PHASE_RPC &&
1988 !req->rq_waiting && !req->rq_resend) ||
1989 (req->rq_phase == RQ_PHASE_BULK)))
1992 if (req->rq_timedout || /* already dealt with */
1993 req->rq_deadline > now) /* not expired */
1997 * Deal with this guy. Do it asynchronously to not block
2000 ptlrpc_expire_one_request(req, 1);
2004 * When waiting for a whole set, we always break out of the
2005 * sleep so we can recalculate the timeout, or enable interrupts
2006 * if everyone's timed out.
2012 * Sets rq_intr flag in \a req under spinlock.
2014 void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
2016 spin_lock(&req->rq_lock);
2018 spin_unlock(&req->rq_lock);
2020 EXPORT_SYMBOL(ptlrpc_mark_interrupted);
2023 * Interrupts (sets interrupted flag) all uncompleted requests in
2024 * a set \a data. Callback for l_wait_event for interruptible waits.
2026 static void ptlrpc_interrupted_set(void *data)
2028 struct ptlrpc_request_set *set = data;
2029 struct list_head *tmp;
2031 CDEBUG(D_RPCTRACE, "INTERRUPTED SET %p\n", set);
2033 list_for_each(tmp, &set->set_requests) {
2034 struct ptlrpc_request *req =
2035 list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2037 if (req->rq_phase != RQ_PHASE_RPC &&
2038 req->rq_phase != RQ_PHASE_UNREG_RPC)
2041 ptlrpc_mark_interrupted(req);
2046 * Get the smallest timeout in the set; this does NOT set a timeout.
2048 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
2050 struct list_head *tmp;
2051 time64_t now = ktime_get_real_seconds();
2053 struct ptlrpc_request *req;
2056 list_for_each(tmp, &set->set_requests) {
2057 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2059 /* Request in-flight? */
2060 if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
2061 (req->rq_phase == RQ_PHASE_BULK) ||
2062 (req->rq_phase == RQ_PHASE_NEW)))
2065 /* Already timed out. */
2066 if (req->rq_timedout)
2069 /* Waiting for ctx. */
2070 if (req->rq_wait_ctx)
2073 if (req->rq_phase == RQ_PHASE_NEW)
2074 deadline = req->rq_sent;
2075 else if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend)
2076 deadline = req->rq_sent;
2078 deadline = req->rq_sent + req->rq_timeout;
2080 if (deadline <= now) /* actually expired already */
2081 timeout = 1; /* ASAP */
2082 else if (timeout == 0 || timeout > deadline - now)
2083 timeout = deadline - now;
2089 * Send all unset request from the set and then wait until all
2090 * requests in the set complete (either get a reply, timeout, get an
2091 * error or otherwise be interrupted).
2092 * Returns 0 on success or error code otherwise.
2094 int ptlrpc_set_wait(struct ptlrpc_request_set *set)
2096 struct list_head *tmp;
2097 struct ptlrpc_request *req;
2098 struct l_wait_info lwi;
2101 if (set->set_producer)
2102 (void)ptlrpc_set_producer(set);
2104 list_for_each(tmp, &set->set_requests) {
2105 req = list_entry(tmp, struct ptlrpc_request,
2107 if (req->rq_phase == RQ_PHASE_NEW)
2108 (void)ptlrpc_send_new_req(req);
2111 if (list_empty(&set->set_requests))
2115 timeout = ptlrpc_set_next_timeout(set);
2118 * wait until all complete, interrupted, or an in-flight
2121 CDEBUG(D_RPCTRACE, "set %p going to sleep for %d seconds\n",
2124 if (timeout == 0 && !signal_pending(current))
2126 * No requests are in-flight (ether timed out
2127 * or delayed), so we can allow interrupts.
2128 * We still want to block for a limited time,
2129 * so we allow interrupts during the timeout.
2131 lwi = LWI_TIMEOUT_INTR_ALL(cfs_time_seconds(1),
2133 ptlrpc_interrupted_set, set);
2136 * At least one request is in flight, so no
2137 * interrupts are allowed. Wait until all
2138 * complete, or an in-flight req times out.
2140 lwi = LWI_TIMEOUT(cfs_time_seconds(timeout ? timeout : 1),
2141 ptlrpc_expired_set, set);
2143 rc = l_wait_event(set->set_waitq, ptlrpc_check_set(NULL, set), &lwi);
2146 * LU-769 - if we ignored the signal because it was already
2147 * pending when we started, we need to handle it now or we risk
2148 * it being ignored forever
2150 if (rc == -ETIMEDOUT && !lwi.lwi_allow_intr &&
2151 signal_pending(current)) {
2152 sigset_t blocked_sigs =
2153 cfs_block_sigsinv(LUSTRE_FATAL_SIGS);
2156 * In fact we only interrupt for the "fatal" signals
2157 * like SIGINT or SIGKILL. We still ignore less
2158 * important signals since ptlrpc set is not easily
2159 * reentrant from userspace again
2161 if (signal_pending(current))
2162 ptlrpc_interrupted_set(set);
2163 cfs_restore_sigs(blocked_sigs);
2166 LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
2169 * -EINTR => all requests have been flagged rq_intr so next
2171 * -ETIMEDOUT => someone timed out. When all reqs have
2172 * timed out, signals are enabled allowing completion with
2174 * I don't really care if we go once more round the loop in
2175 * the error cases -eeb.
2177 if (rc == 0 && atomic_read(&set->set_remaining) == 0) {
2178 list_for_each(tmp, &set->set_requests) {
2179 req = list_entry(tmp, struct ptlrpc_request,
2181 spin_lock(&req->rq_lock);
2182 req->rq_invalid_rqset = 1;
2183 spin_unlock(&req->rq_lock);
2186 } while (rc != 0 || atomic_read(&set->set_remaining) != 0);
2188 LASSERT(atomic_read(&set->set_remaining) == 0);
2190 rc = set->set_rc; /* rq_status of already freed requests if any */
2191 list_for_each(tmp, &set->set_requests) {
2192 req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
2194 LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
2195 if (req->rq_status != 0)
2196 rc = req->rq_status;
2199 if (set->set_interpret) {
2200 int (*interpreter)(struct ptlrpc_request_set *set, void *, int) =
2202 rc = interpreter(set, set->set_arg, rc);
2204 struct ptlrpc_set_cbdata *cbdata, *n;
2207 list_for_each_entry_safe(cbdata, n,
2208 &set->set_cblist, psc_item) {
2209 list_del_init(&cbdata->psc_item);
2210 err = cbdata->psc_interpret(set, cbdata->psc_data, rc);
2219 EXPORT_SYMBOL(ptlrpc_set_wait);
2222 * Helper function for request freeing.
2223 * Called when request count reached zero and request needs to be freed.
2224 * Removes request from all sorts of sending/replay lists it might be on,
2225 * frees network buffers if any are present.
2226 * If \a locked is set, that means caller is already holding import imp_lock
2227 * and so we no longer need to reobtain it (for certain lists manipulations)
2229 static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
2233 LASSERT(!request->rq_srv_req);
2234 LASSERT(!request->rq_export);
2235 LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
2236 LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
2237 LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
2238 LASSERTF(!request->rq_replay, "req %p\n", request);
2240 req_capsule_fini(&request->rq_pill);
2243 * We must take it off the imp_replay_list first. Otherwise, we'll set
2244 * request->rq_reqmsg to NULL while osc_close is dereferencing it.
2246 if (request->rq_import) {
2248 spin_lock(&request->rq_import->imp_lock);
2249 list_del_init(&request->rq_replay_list);
2251 spin_unlock(&request->rq_import->imp_lock);
2253 LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
2255 if (atomic_read(&request->rq_refcount) != 0) {
2256 DEBUG_REQ(D_ERROR, request,
2257 "freeing request with nonzero refcount");
2261 if (request->rq_repbuf)
2262 sptlrpc_cli_free_repbuf(request);
2264 if (request->rq_import) {
2265 class_import_put(request->rq_import);
2266 request->rq_import = NULL;
2268 if (request->rq_bulk)
2269 ptlrpc_free_bulk_pin(request->rq_bulk);
2271 if (request->rq_reqbuf || request->rq_clrbuf)
2272 sptlrpc_cli_free_reqbuf(request);
2274 if (request->rq_cli_ctx)
2275 sptlrpc_req_put_ctx(request, !locked);
2277 if (request->rq_pool)
2278 __ptlrpc_free_req_to_pool(request);
2280 ptlrpc_request_cache_free(request);
2285 * Drops one reference count for request \a request.
2286 * \a locked set indicates that caller holds import imp_lock.
2287 * Frees the request when reference count reaches zero.
2289 static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
2294 if (request == LP_POISON ||
2295 request->rq_reqmsg == LP_POISON) {
2296 CERROR("dereferencing freed request (bug 575)\n");
2301 DEBUG_REQ(D_INFO, request, "refcount now %u",
2302 atomic_read(&request->rq_refcount) - 1);
2304 if (atomic_dec_and_test(&request->rq_refcount)) {
2305 __ptlrpc_free_req(request, locked);
2313 * Drops one reference count for a request.
2315 void ptlrpc_req_finished(struct ptlrpc_request *request)
2317 __ptlrpc_req_finished(request, 0);
2319 EXPORT_SYMBOL(ptlrpc_req_finished);
2322 * Returns xid of a \a request
2324 __u64 ptlrpc_req_xid(struct ptlrpc_request *request)
2326 return request->rq_xid;
2328 EXPORT_SYMBOL(ptlrpc_req_xid);
2331 * Disengage the client's reply buffer from the network
2332 * NB does _NOT_ unregister any client-side bulk.
2333 * IDEMPOTENT, but _not_ safe against concurrent callers.
2334 * The request owner (i.e. the thread doing the I/O) must call...
2335 * Returns 0 on success or 1 if unregistering cannot be made.
2337 static int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async)
2340 wait_queue_head_t *wq;
2341 struct l_wait_info lwi;
2344 LASSERT(!in_interrupt());
2346 /* Let's setup deadline for reply unlink. */
2347 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
2348 async && request->rq_reply_deadline == 0 && cfs_fail_val == 0)
2349 request->rq_reply_deadline =
2350 ktime_get_real_seconds() + LONG_UNLINK;
2352 /* Nothing left to do. */
2353 if (!ptlrpc_client_recv_or_unlink(request))
2356 LNetMDUnlink(request->rq_reply_md_h);
2358 /* Let's check it once again. */
2359 if (!ptlrpc_client_recv_or_unlink(request))
2362 /* Move to "Unregistering" phase as reply was not unlinked yet. */
2363 ptlrpc_rqphase_move(request, RQ_PHASE_UNREG_RPC);
2365 /* Do not wait for unlink to finish. */
2370 * We have to l_wait_event() whatever the result, to give liblustre
2371 * a chance to run reply_in_callback(), and to make sure we've
2372 * unlinked before returning a req to the pool.
2374 if (request->rq_set)
2375 wq = &request->rq_set->set_waitq;
2377 wq = &request->rq_reply_waitq;
2381 * Network access will complete in finite time but the HUGE
2382 * timeout lets us CWARN for visibility of sluggish NALs
2384 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
2385 cfs_time_seconds(1), NULL, NULL);
2386 rc = l_wait_event(*wq, !ptlrpc_client_recv_or_unlink(request),
2389 ptlrpc_rqphase_move(request, request->rq_next_phase);
2393 LASSERT(rc == -ETIMEDOUT);
2394 DEBUG_REQ(D_WARNING, request,
2395 "Unexpectedly long timeout receiving_reply=%d req_ulinked=%d reply_unlinked=%d",
2396 request->rq_receiving_reply,
2397 request->rq_req_unlinked,
2398 request->rq_reply_unlinked);
2403 static void ptlrpc_free_request(struct ptlrpc_request *req)
2405 spin_lock(&req->rq_lock);
2407 spin_unlock(&req->rq_lock);
2409 if (req->rq_commit_cb)
2410 req->rq_commit_cb(req);
2411 list_del_init(&req->rq_replay_list);
2413 __ptlrpc_req_finished(req, 1);
2417 * the request is committed and dropped from the replay list of its import
2419 void ptlrpc_request_committed(struct ptlrpc_request *req, int force)
2421 struct obd_import *imp = req->rq_import;
2423 spin_lock(&imp->imp_lock);
2424 if (list_empty(&req->rq_replay_list)) {
2425 spin_unlock(&imp->imp_lock);
2429 if (force || req->rq_transno <= imp->imp_peer_committed_transno)
2430 ptlrpc_free_request(req);
2432 spin_unlock(&imp->imp_lock);
2434 EXPORT_SYMBOL(ptlrpc_request_committed);
2437 * Iterates through replay_list on import and prunes
2438 * all requests have transno smaller than last_committed for the
2439 * import and don't have rq_replay set.
2440 * Since requests are sorted in transno order, stops when meeting first
2441 * transno bigger than last_committed.
2442 * caller must hold imp->imp_lock
2444 void ptlrpc_free_committed(struct obd_import *imp)
2446 struct ptlrpc_request *req, *saved;
2447 struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
2448 bool skip_committed_list = true;
2450 assert_spin_locked(&imp->imp_lock);
2452 if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
2453 imp->imp_generation == imp->imp_last_generation_checked) {
2454 CDEBUG(D_INFO, "%s: skip recheck: last_committed %llu\n",
2455 imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
2458 CDEBUG(D_RPCTRACE, "%s: committing for last_committed %llu gen %d\n",
2459 imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
2460 imp->imp_generation);
2462 if (imp->imp_generation != imp->imp_last_generation_checked ||
2463 !imp->imp_last_transno_checked)
2464 skip_committed_list = false;
2466 imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
2467 imp->imp_last_generation_checked = imp->imp_generation;
2469 list_for_each_entry_safe(req, saved, &imp->imp_replay_list,
2471 /* XXX ok to remove when 1357 resolved - rread 05/29/03 */
2472 LASSERT(req != last_req);
2475 if (req->rq_transno == 0) {
2476 DEBUG_REQ(D_EMERG, req, "zero transno during replay");
2479 if (req->rq_import_generation < imp->imp_generation) {
2480 DEBUG_REQ(D_RPCTRACE, req, "free request with old gen");
2484 /* not yet committed */
2485 if (req->rq_transno > imp->imp_peer_committed_transno) {
2486 DEBUG_REQ(D_RPCTRACE, req, "stopping search");
2490 if (req->rq_replay) {
2491 DEBUG_REQ(D_RPCTRACE, req, "keeping (FL_REPLAY)");
2492 list_move_tail(&req->rq_replay_list,
2493 &imp->imp_committed_list);
2497 DEBUG_REQ(D_INFO, req, "commit (last_committed %llu)",
2498 imp->imp_peer_committed_transno);
2500 ptlrpc_free_request(req);
2502 if (skip_committed_list)
2505 list_for_each_entry_safe(req, saved, &imp->imp_committed_list,
2507 LASSERT(req->rq_transno != 0);
2508 if (req->rq_import_generation < imp->imp_generation) {
2509 DEBUG_REQ(D_RPCTRACE, req, "free stale open request");
2510 ptlrpc_free_request(req);
2511 } else if (!req->rq_replay) {
2512 DEBUG_REQ(D_RPCTRACE, req, "free closed open request");
2513 ptlrpc_free_request(req);
2519 * Schedule previously sent request for resend.
2520 * For bulk requests we assign new xid (to avoid problems with
2521 * lost replies and therefore several transfers landing into same buffer
2522 * from different sending attempts).
2524 void ptlrpc_resend_req(struct ptlrpc_request *req)
2526 DEBUG_REQ(D_HA, req, "going to resend");
2527 spin_lock(&req->rq_lock);
2530 * Request got reply but linked to the import list still.
2531 * Let ptlrpc_check_set() to process it.
2533 if (ptlrpc_client_replied(req)) {
2534 spin_unlock(&req->rq_lock);
2535 DEBUG_REQ(D_HA, req, "it has reply, so skip it");
2539 lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 });
2540 req->rq_status = -EAGAIN;
2543 req->rq_net_err = 0;
2544 req->rq_timedout = 0;
2546 __u64 old_xid = req->rq_xid;
2548 /* ensure previous bulk fails */
2549 req->rq_xid = ptlrpc_next_xid();
2550 CDEBUG(D_HA, "resend bulk old x%llu new x%llu\n",
2551 old_xid, req->rq_xid);
2553 ptlrpc_client_wake_req(req);
2554 spin_unlock(&req->rq_lock);
2558 * Grab additional reference on a request \a req
2560 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
2562 atomic_inc(&req->rq_refcount);
2565 EXPORT_SYMBOL(ptlrpc_request_addref);
2568 * Add a request to import replay_list.
2569 * Must be called under imp_lock
2571 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
2572 struct obd_import *imp)
2574 struct list_head *tmp;
2576 assert_spin_locked(&imp->imp_lock);
2578 if (req->rq_transno == 0) {
2579 DEBUG_REQ(D_EMERG, req, "saving request with zero transno");
2584 * clear this for new requests that were resent as well
2585 * as resent replayed requests.
2587 lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
2589 /* don't re-add requests that have been replayed */
2590 if (!list_empty(&req->rq_replay_list))
2593 lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
2595 LASSERT(imp->imp_replayable);
2596 /* Balanced in ptlrpc_free_committed, usually. */
2597 ptlrpc_request_addref(req);
2598 list_for_each_prev(tmp, &imp->imp_replay_list) {
2599 struct ptlrpc_request *iter =
2600 list_entry(tmp, struct ptlrpc_request, rq_replay_list);
2603 * We may have duplicate transnos if we create and then
2604 * open a file, or for closes retained if to match creating
2605 * opens, so use req->rq_xid as a secondary key.
2606 * (See bugs 684, 685, and 428.)
2607 * XXX no longer needed, but all opens need transnos!
2609 if (iter->rq_transno > req->rq_transno)
2612 if (iter->rq_transno == req->rq_transno) {
2613 LASSERT(iter->rq_xid != req->rq_xid);
2614 if (iter->rq_xid > req->rq_xid)
2618 list_add(&req->rq_replay_list, &iter->rq_replay_list);
2622 list_add(&req->rq_replay_list, &imp->imp_replay_list);
2626 * Send request and wait until it completes.
2627 * Returns request processing status.
2629 int ptlrpc_queue_wait(struct ptlrpc_request *req)
2631 struct ptlrpc_request_set *set;
2634 LASSERT(!req->rq_set);
2635 LASSERT(!req->rq_receiving_reply);
2637 set = ptlrpc_prep_set();
2639 CERROR("cannot allocate ptlrpc set: rc = %d\n", -ENOMEM);
2643 /* for distributed debugging */
2644 lustre_msg_set_status(req->rq_reqmsg, current_pid());
2646 /* add a ref for the set (see comment in ptlrpc_set_add_req) */
2647 ptlrpc_request_addref(req);
2648 ptlrpc_set_add_req(set, req);
2649 rc = ptlrpc_set_wait(set);
2650 ptlrpc_set_destroy(set);
2654 EXPORT_SYMBOL(ptlrpc_queue_wait);
2657 * Callback used for replayed requests reply processing.
2658 * In case of successful reply calls registered request replay callback.
2659 * In case of error restart replay process.
2661 static int ptlrpc_replay_interpret(const struct lu_env *env,
2662 struct ptlrpc_request *req,
2665 struct ptlrpc_replay_async_args *aa = data;
2666 struct obd_import *imp = req->rq_import;
2668 atomic_dec(&imp->imp_replay_inflight);
2670 if (!ptlrpc_client_replied(req)) {
2671 CERROR("request replay timed out, restarting recovery\n");
2676 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR &&
2677 (lustre_msg_get_status(req->rq_repmsg) == -ENOTCONN ||
2678 lustre_msg_get_status(req->rq_repmsg) == -ENODEV)) {
2679 rc = lustre_msg_get_status(req->rq_repmsg);
2683 /** VBR: check version failure */
2684 if (lustre_msg_get_status(req->rq_repmsg) == -EOVERFLOW) {
2685 /** replay was failed due to version mismatch */
2686 DEBUG_REQ(D_WARNING, req, "Version mismatch during replay\n");
2687 spin_lock(&imp->imp_lock);
2688 imp->imp_vbr_failed = 1;
2689 imp->imp_no_lock_replay = 1;
2690 spin_unlock(&imp->imp_lock);
2691 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
2693 /** The transno had better not change over replay. */
2694 LASSERTF(lustre_msg_get_transno(req->rq_reqmsg) ==
2695 lustre_msg_get_transno(req->rq_repmsg) ||
2696 lustre_msg_get_transno(req->rq_repmsg) == 0,
2698 lustre_msg_get_transno(req->rq_reqmsg),
2699 lustre_msg_get_transno(req->rq_repmsg));
2702 spin_lock(&imp->imp_lock);
2703 /** if replays by version then gap occur on server, no trust to locks */
2704 if (lustre_msg_get_flags(req->rq_repmsg) & MSG_VERSION_REPLAY)
2705 imp->imp_no_lock_replay = 1;
2706 imp->imp_last_replay_transno = lustre_msg_get_transno(req->rq_reqmsg);
2707 spin_unlock(&imp->imp_lock);
2708 LASSERT(imp->imp_last_replay_transno);
2710 /* transaction number shouldn't be bigger than the latest replayed */
2711 if (req->rq_transno > lustre_msg_get_transno(req->rq_reqmsg)) {
2712 DEBUG_REQ(D_ERROR, req,
2713 "Reported transno %llu is bigger than the replayed one: %llu",
2715 lustre_msg_get_transno(req->rq_reqmsg));
2720 DEBUG_REQ(D_HA, req, "got rep");
2722 /* let the callback do fixups, possibly including in the request */
2723 if (req->rq_replay_cb)
2724 req->rq_replay_cb(req);
2726 if (ptlrpc_client_replied(req) &&
2727 lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
2728 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
2729 lustre_msg_get_status(req->rq_repmsg),
2730 aa->praa_old_status);
2732 /* Put it back for re-replay. */
2733 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
2737 * Errors while replay can set transno to 0, but
2738 * imp_last_replay_transno shouldn't be set to 0 anyway
2740 if (req->rq_transno == 0)
2741 CERROR("Transno is 0 during replay!\n");
2743 /* continue with recovery */
2744 rc = ptlrpc_import_recovery_state_machine(imp);
2746 req->rq_send_state = aa->praa_old_state;
2749 /* this replay failed, so restart recovery */
2750 ptlrpc_connect_import(imp);
2756 * Prepares and queues request for replay.
2757 * Adds it to ptlrpcd queue for actual sending.
2758 * Returns 0 on success.
2760 int ptlrpc_replay_req(struct ptlrpc_request *req)
2762 struct ptlrpc_replay_async_args *aa;
2764 LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
2766 LASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2767 aa = ptlrpc_req_async_args(req);
2768 memset(aa, 0, sizeof(*aa));
2770 /* Prepare request to be resent with ptlrpcd */
2771 aa->praa_old_state = req->rq_send_state;
2772 req->rq_send_state = LUSTRE_IMP_REPLAY;
2773 req->rq_phase = RQ_PHASE_NEW;
2774 req->rq_next_phase = RQ_PHASE_UNDEFINED;
2776 aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg);
2778 req->rq_interpret_reply = ptlrpc_replay_interpret;
2779 /* Readjust the timeout for current conditions */
2780 ptlrpc_at_set_req_timeout(req);
2783 * Tell server the net_latency, so the server can calculate how long
2784 * it should wait for next replay
2786 lustre_msg_set_service_time(req->rq_reqmsg,
2787 ptlrpc_at_get_net_latency(req));
2788 DEBUG_REQ(D_HA, req, "REPLAY");
2790 atomic_inc(&req->rq_import->imp_replay_inflight);
2791 ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
2793 ptlrpcd_add_req(req);
2798 * Aborts all in-flight request on import \a imp sending and delayed lists
2800 void ptlrpc_abort_inflight(struct obd_import *imp)
2802 struct list_head *tmp, *n;
2805 * Make sure that no new requests get processed for this import.
2806 * ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
2807 * this flag and then putting requests on sending_list or delayed_list.
2809 spin_lock(&imp->imp_lock);
2812 * XXX locking? Maybe we should remove each request with the list
2813 * locked? Also, how do we know if the requests on the list are
2814 * being freed at this time?
2816 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
2817 struct ptlrpc_request *req =
2818 list_entry(tmp, struct ptlrpc_request, rq_list);
2820 DEBUG_REQ(D_RPCTRACE, req, "inflight");
2822 spin_lock(&req->rq_lock);
2823 if (req->rq_import_generation < imp->imp_generation) {
2825 req->rq_status = -EIO;
2826 ptlrpc_client_wake_req(req);
2828 spin_unlock(&req->rq_lock);
2831 list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
2832 struct ptlrpc_request *req =
2833 list_entry(tmp, struct ptlrpc_request, rq_list);
2835 DEBUG_REQ(D_RPCTRACE, req, "aborting waiting req");
2837 spin_lock(&req->rq_lock);
2838 if (req->rq_import_generation < imp->imp_generation) {
2840 req->rq_status = -EIO;
2841 ptlrpc_client_wake_req(req);
2843 spin_unlock(&req->rq_lock);
2847 * Last chance to free reqs left on the replay list, but we
2848 * will still leak reqs that haven't committed.
2850 if (imp->imp_replayable)
2851 ptlrpc_free_committed(imp);
2853 spin_unlock(&imp->imp_lock);
2857 * Abort all uncompleted requests in request set \a set
2859 void ptlrpc_abort_set(struct ptlrpc_request_set *set)
2861 struct list_head *tmp, *pos;
2863 list_for_each_safe(pos, tmp, &set->set_requests) {
2864 struct ptlrpc_request *req =
2865 list_entry(pos, struct ptlrpc_request, rq_set_chain);
2867 spin_lock(&req->rq_lock);
2868 if (req->rq_phase != RQ_PHASE_RPC) {
2869 spin_unlock(&req->rq_lock);
2874 req->rq_status = -EINTR;
2875 ptlrpc_client_wake_req(req);
2876 spin_unlock(&req->rq_lock);
2880 static __u64 ptlrpc_last_xid;
2881 static spinlock_t ptlrpc_last_xid_lock;
2884 * Initialize the XID for the node. This is common among all requests on
2885 * this node, and only requires the property that it is monotonically
2886 * increasing. It does not need to be sequential. Since this is also used
2887 * as the RDMA match bits, it is important that a single client NOT have
2888 * the same match bits for two different in-flight requests, hence we do
2889 * NOT want to have an XID per target or similar.
2891 * To avoid an unlikely collision between match bits after a client reboot
2892 * (which would deliver old data into the wrong RDMA buffer) initialize
2893 * the XID based on the current time, assuming a maximum RPC rate of 1M RPC/s.
2894 * If the time is clearly incorrect, we instead use a 62-bit random number.
2895 * In the worst case the random number will overflow 1M RPCs per second in
2896 * 9133 years, or permutations thereof.
2898 #define YEAR_2004 (1ULL << 30)
2899 void ptlrpc_init_xid(void)
2901 time64_t now = ktime_get_real_seconds();
2903 spin_lock_init(&ptlrpc_last_xid_lock);
2904 if (now < YEAR_2004) {
2905 cfs_get_random_bytes(&ptlrpc_last_xid, sizeof(ptlrpc_last_xid));
2906 ptlrpc_last_xid >>= 2;
2907 ptlrpc_last_xid |= (1ULL << 61);
2909 ptlrpc_last_xid = (__u64)now << 20;
2912 /* Always need to be aligned to a power-of-two for multi-bulk BRW */
2913 CLASSERT(((PTLRPC_BULK_OPS_COUNT - 1) & PTLRPC_BULK_OPS_COUNT) == 0);
2914 ptlrpc_last_xid &= PTLRPC_BULK_OPS_MASK;
2918 * Increase xid and returns resulting new value to the caller.
2920 * Multi-bulk BRW RPCs consume multiple XIDs for each bulk transfer, starting
2921 * at the returned xid, up to xid + PTLRPC_BULK_OPS_COUNT - 1. The BRW RPC
2922 * itself uses the last bulk xid needed, so the server can determine the
2923 * the number of bulk transfers from the RPC XID and a bitmask. The starting
2924 * xid must align to a power-of-two value.
2926 * This is assumed to be true due to the initial ptlrpc_last_xid
2927 * value also being initialized to a power-of-two value. LU-1431
2929 __u64 ptlrpc_next_xid(void)
2933 spin_lock(&ptlrpc_last_xid_lock);
2934 next = ptlrpc_last_xid + PTLRPC_BULK_OPS_COUNT;
2935 ptlrpc_last_xid = next;
2936 spin_unlock(&ptlrpc_last_xid_lock);
2942 * Get a glimpse at what next xid value might have been.
2943 * Returns possible next xid.
2945 __u64 ptlrpc_sample_next_xid(void)
2947 #if BITS_PER_LONG == 32
2948 /* need to avoid possible word tearing on 32-bit systems */
2951 spin_lock(&ptlrpc_last_xid_lock);
2952 next = ptlrpc_last_xid + PTLRPC_BULK_OPS_COUNT;
2953 spin_unlock(&ptlrpc_last_xid_lock);
2957 /* No need to lock, since returned value is racy anyways */
2958 return ptlrpc_last_xid + PTLRPC_BULK_OPS_COUNT;
2961 EXPORT_SYMBOL(ptlrpc_sample_next_xid);
2964 * Functions for operating ptlrpc workers.
2966 * A ptlrpc work is a function which will be running inside ptlrpc context.
2967 * The callback shouldn't sleep otherwise it will block that ptlrpcd thread.
2969 * 1. after a work is created, it can be used many times, that is:
2970 * handler = ptlrpcd_alloc_work();
2971 * ptlrpcd_queue_work();
2973 * queue it again when necessary:
2974 * ptlrpcd_queue_work();
2975 * ptlrpcd_destroy_work();
2976 * 2. ptlrpcd_queue_work() can be called by multiple processes meanwhile, but
2977 * it will only be queued once in any time. Also as its name implies, it may
2978 * have delay before it really runs by ptlrpcd thread.
2980 struct ptlrpc_work_async_args {
2981 int (*cb)(const struct lu_env *, void *);
2985 static void ptlrpcd_add_work_req(struct ptlrpc_request *req)
2987 /* re-initialize the req */
2988 req->rq_timeout = obd_timeout;
2989 req->rq_sent = ktime_get_real_seconds();
2990 req->rq_deadline = req->rq_sent + req->rq_timeout;
2991 req->rq_phase = RQ_PHASE_INTERPRET;
2992 req->rq_next_phase = RQ_PHASE_COMPLETE;
2993 req->rq_xid = ptlrpc_next_xid();
2994 req->rq_import_generation = req->rq_import->imp_generation;
2996 ptlrpcd_add_req(req);
2999 static int work_interpreter(const struct lu_env *env,
3000 struct ptlrpc_request *req, void *data, int rc)
3002 struct ptlrpc_work_async_args *arg = data;
3004 LASSERT(ptlrpcd_check_work(req));
3006 rc = arg->cb(env, arg->cbdata);
3008 list_del_init(&req->rq_set_chain);
3011 if (atomic_dec_return(&req->rq_refcount) > 1) {
3012 atomic_set(&req->rq_refcount, 2);
3013 ptlrpcd_add_work_req(req);
3018 static int worker_format;
3020 static int ptlrpcd_check_work(struct ptlrpc_request *req)
3022 return req->rq_pill.rc_fmt == (void *)&worker_format;
3026 * Create a work for ptlrpc.
3028 void *ptlrpcd_alloc_work(struct obd_import *imp,
3029 int (*cb)(const struct lu_env *, void *), void *cbdata)
3031 struct ptlrpc_request *req = NULL;
3032 struct ptlrpc_work_async_args *args;
3037 return ERR_PTR(-EINVAL);
3039 /* copy some code from deprecated fakereq. */
3040 req = ptlrpc_request_cache_alloc(GFP_NOFS);
3042 CERROR("ptlrpc: run out of memory!\n");
3043 return ERR_PTR(-ENOMEM);
3046 ptlrpc_cli_req_init(req);
3048 req->rq_send_state = LUSTRE_IMP_FULL;
3049 req->rq_type = PTL_RPC_MSG_REQUEST;
3050 req->rq_import = class_import_get(imp);
3051 req->rq_interpret_reply = work_interpreter;
3052 /* don't want reply */
3053 req->rq_no_delay = 1;
3054 req->rq_no_resend = 1;
3055 req->rq_pill.rc_fmt = (void *)&worker_format;
3057 CLASSERT(sizeof(*args) <= sizeof(req->rq_async_args));
3058 args = ptlrpc_req_async_args(req);
3060 args->cbdata = cbdata;
3064 EXPORT_SYMBOL(ptlrpcd_alloc_work);
3066 void ptlrpcd_destroy_work(void *handler)
3068 struct ptlrpc_request *req = handler;
3071 ptlrpc_req_finished(req);
3073 EXPORT_SYMBOL(ptlrpcd_destroy_work);
3075 int ptlrpcd_queue_work(void *handler)
3077 struct ptlrpc_request *req = handler;
3080 * Check if the req is already being queued.
3082 * Here comes a trick: it lacks a way of checking if a req is being
3083 * processed reliably in ptlrpc. Here I have to use refcount of req
3084 * for this purpose. This is okay because the caller should use this
3085 * req as opaque data. - Jinshan
3087 LASSERT(atomic_read(&req->rq_refcount) > 0);
3088 if (atomic_inc_return(&req->rq_refcount) == 2)
3089 ptlrpcd_add_work_req(req);
3092 EXPORT_SYMBOL(ptlrpcd_queue_work);